How to set pilot bushing depth And why it’s IMPORTANT - With NASCAR Engine builder Brian Hambly

Рет қаралды 2,242

2 ай бұрын

Are you installing a manual transmission, do you have the right pilot bushing depth?
Why is it so important?
Before you install your truck and transmission
watch this instructional video we took at Forsyth Technical College in Winston Salem NC, with longtime NASCAR engine builder Brian Hambly.
The engine in the video is a SBC Small Block Chevy, but the process is the same for any engine you may be working on.

Пікірлер: 26

@robertwest3093 Ай бұрын

Thank you for making this video. This is something that needs to be checked any time a new bearing/bushing is installed or even when installing a different transmission of the same type. The input shaft length could vary ever so slightly from trans to trans because of production tolerances. This is one reason I love your channel so much!

@goldsgarage8236 Ай бұрын

Thanks Robert, most people don't give this much thought. AG

@jeffreydurham5342 2 ай бұрын

Ran into this when I built my 67 ss 396 4 speed chevelle. Was just a kid and had an aftermarket scatter shield. Got a vibration in the driveline after a couple months of driving. Noticed that I could change the vibration by releasing and engaging the clutch. Pulled it apart and found the trans input was barely in the pilot bushing and was "flopping around" . New pilot to the correct depth and was all good. Been 50 years ago.

@goldsgarage8236 2 ай бұрын

Thanks for the comment Jeffrey, exactly why I thought making this video would be helpful.AG

@kimmorrison9169 2 ай бұрын

‘67 Chevelle=best looking Chevelle ever made.

@toddbrown2236 2 ай бұрын

Well, I just learned something important that I absolutely did not know. I'll need to re-watch this video a few times and do some reading before I install the flywheel and new clutch assembly on that beautiful engine you built for me, Allan. The last thing I want is to screw this up and make a mess of the engine. Thanks a ton for this video.

@goldsgarage8236 2 ай бұрын

Thanks Todd. We can discuss this more when you are here. AG

@mediumjumbo7484 2 ай бұрын

How far in ? All the way home 👍👍

@Alaska_Engineer 2 ай бұрын

That’s the hard way to do it. When my trans & engine are out like yours are, I do a test fit with modeling clay and no bearing.

@leonardfoster6252 2 ай бұрын

AG, some people seem to have a lot of trouble with building engines or other mechanical parts like the trans. bushings in the crankshaft. Some people just don't know much about stick shift transmissions, clutches etc...

@goldsgarage8236 2 ай бұрын

Thanks for the comment Leonard. AG

@flinch622 2 ай бұрын

Something tells me some people find trouble where they build the short block first, than go looking for a transmission? I think I might like this bushing installed before balancing.

@jeffreydurham5342 2 ай бұрын

I doubt that a pretty much concentric bushing in the center of that shaft would have any measurable effect on the balance of the engine.

@flinch622 2 ай бұрын

@@jeffreydurham5342 Its a fair observation as far as location of mass goes, but I would want to know - bushing mass effectively acts as part of the crank once installed. Mainly, my thinking was if it gets pressed in after initial mock up/measurements then depth is easier to contol & set. As a bonus, less chance of mushrooming and nobody's wailing on a crank with a shop hammer, and thrust bearings don't begin life with an insult.

@jeffreydurham5342 2 ай бұрын

@@flinch622 so you're going to put the crankshaft in the block, and measure how far the pilot bushing needs to be by assembling the transmission and bellhousing together and measuring before balancing?

@jeffreydurham5342 2 ай бұрын

@@flinch622 I see why there is such a long waiting list on your engines.

@bigal878 2 ай бұрын

Good reminder to check your input shaft to bush/bearing clearance, but not the best explanation of how to measure and less than ideal execution. Anyway, I think we can all learn something from this.

@goldsgarage8236 2 ай бұрын

Thanks for the comment. AG

@4speed3pedals 2 ай бұрын

Why is the installer not using a bushing driver? Kind of shade tree for a shop to be doing.

@jeffreydurham5342 2 ай бұрын

I thought it was sketch that he was hitting that input shaft with a hammer, kinda dangerous in my opinion. I would have been good with smacking it in with an appropriately sized socket!

@patrickharper9297 2 ай бұрын

why bang on a good socket when you have a box full of shafts and a machine shop

@goldsgarage8236 2 ай бұрын

Thanks Patrick. AG